tee into underfloor 22mm copper pipe

[HairGoneJohn]

Hi

I want to add another ground floor radiator between two existing rads on an existing CH system. The pipes have been laid into the concrete floor,and run along the edge of the room about 2" from the surface.

I can hack out the concrete around the 22mm copper pipes but obviously cannot cut and separate them to insert the tees. Are there any special fittings that perhaps can be clamped around the pipes and then pierce them to connect my 15mm feed/return to the new radiator? Or is there another method?

thanks
HairGoneJohn

 

[ecowarm]

No special fittings just cut out a section and use a tee and a slip socket, it will be quite difficult and maybe not a diy job

 

[gassafe]

The water will stay in the pipework no doubt and make trying to solder the joints a nightmare! Good luck tho =]

 

[HairGoneJohn]

Thanks for the amazing immediate response !

I do not want to try soldering because of the remaining water as you say. Would a Speedfit plastic slip socket be a good idea ? And is it possible to get 22/15/22mm reducing slip tees?

Finally, the CH system was probably installed in 1987. Are the pipes likely to be imperial or metric, and is there an easy way to tell them apart before cutting them?

thanks again

 

[Gray0689]

Get a plumber in mate think it's over your head

 

[ecowarm]

1987 its metric

 

[ecowarm]

I would not go for speedfit what about compession

 

[HairGoneJohn]

thanks for all your help.

 

[wheeto]

You can't get slip fittings as pushfit (speedfit etc) and doubt you can as compression either. Soldering will be your only sensible option.

 

[smtplumbing]

quick thought, i have done it before freezer kit to ends of the pipe cut your tee in a solder fast as, done it twice, 2nd time soo was close but have worked well

 

[HairGoneJohn]

Speedfit do 15 and 22mm slip tees. Just google "speedfit 22mm slip tee". I am told that compression slip tees are also available. Thanks for the freezing suggestion.

 

[wheeto]

I stand corrected! Still wouldn't recommend for you though as you intend to bury the coupling.

 

[Phil]

Yes its a tuff one this, Speedfit would be the best choice for a diy'er but as said they can't be burried, the only choice is to solder which will require draindown and plumber.

Even compression fittings cannot be 'hidden'.

 

[AWheating]

speedfit would make it hard to try and guard against corrosion in the future, the best solution would be soldered fittings then taped up to protect them from the concreate. the best way to ensure it will solder is to use a wet and dry vacume and suck out the water, then soldering will be straight forward.